版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/d3.chart/0.3.0/d3.chart.js
- https://cdn.bootcdn.net/ajax/libs/d3.chart/0.3.0/d3.chart.min.js
- https://cdn.bootcdn.net/ajax/libs/d3.chart/0.3.0/d3.chart.min.map
A framework for creating reusable charts with D3.js